What is the easiest way to move an object along an arc under a given time?
The Curved movement extension I found requires predefined paths, however in my case I only know the angles and radius of the arc - but not the position - ahead.
I also found this example, but I want the object to move along only a given arc, and not a full circle.
I really want to know about this because a lot of games use it. I have an idea as creating points through an arc and moving the instance one from another to move it across a path. But how to do that? 
I’m most positive we can do it in gdevelop.
Maybe this video would help: (1) Add Aim Feature in GDevelop 5 - Physics Engine Tutorial - YouTube
What’s stopping you from using the Put object around another action once you know the centre of the arc?
What do you want to move along the arc? A little more context might help get a better answer. Have you thought of using the physics behavior?
The setup I have is something like this:
These tiles with different roads on them will be placed next to each other. Then I need to move the player along the road it’s currently on.
Since the road on the right tile only contains straight segments, I used the tween on the player to move it. But for any of the paths on the left tile I can’t use tween.
Additionally, all of this player movement is defined in a function and then used in an event with Trigger once as a condition, so I don’t see a way to use the Put object around another action.
Something I’ve wanted to try is using the Read Pixel extension to read the color at a point and use it to follow a line. IDK if it would work in this situation. (Sort of like those line following robots)
As mentioned, you could use place around a point and either use numbers or points on the object as the center point.
This example uses the cursor as the center position and a variable tween to tween the angle from 0 to 180. The speed can be adjusted by calculating the length of the line.
That’s exactly what I was thinking of, but I didn’t know about the Read Pixel extension.
But I guess the other solution with the Put object around another is the easiest to implement so I will use that.
I started working on a project. There are different strategies. This uses a center front point for movement and left and right to turn. It doesn’t work well with sharp turns. I want to try other strategies. I’ve used these strategies in a bot game called LogicBot. When I get the bugs fixed, I might start a new thread.
It requires a consistent line. So, to draw the line I added another sprite that will follow the mouse when it’s pressed. The bot and drawing dot are both draggable. Again, this is very early and crude.
I’m unsure when I can finish this.
Try online, draw a line and then place the bot on the line.
Edit: there are multiple strategies. You can put the “sensors” on the line or outside of the line and flip the way it steers. You can also do a combination of both.
The difference between this solution and the way real robots follow a line is that a sensor of a robot will measure the reflected light from the surface, and in case of a white background and a black line, it will return any “brightness” between 0 and 225. This is useful because then you can then change the steering angle based on this value. But I think it would be quite complicated to implement this behaviour in Gdevelop.
Use whatever technique you think fits your project the best. I’m still going to play around with the idea for fun. I wish you well.
